Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/22—Plastics; Metallised plastics
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]

Definitions

• the present invention relates to a double-sided adhesive device capable of being removed by stretching the adhesive by means of a tongue.
• the invention proposes a technical solution belonging to the field of temporary or non-fixing of objects, between them or on a support, by means of an adhesive element on its two faces, said fixing being reversible, that is to say say that it is possible to separate the assembled objects without damaging them.
• This field of application is different from that of the adhesives which is preferably used when it is desired to obtain a definitive and non-reversible assembly.
• Adhesive pastes are generally used which temporarily fix posters or light objects.
• EP-578 979 it is recommended to provide at one end of the tape, a protective layer opaque to ultraviolet rays to avoid the appearance of tears when pulling on the tape for separation between the support and the object that was attached to it.
• a protective layer opaque to ultraviolet rays it is recommended to provide at one end of the tape, a protective layer opaque to ultraviolet rays to avoid the appearance of tears when pulling on the tape for separation between the support and the object that was attached to it.
• the end of the tape protected against UN. also serves as a pull tab.
• the object of the present invention is to remedy the aforementioned drawbacks and to propose a new temporary fixing device in which the entire stretch adhesive film can be behind the fixed object.
• the present invention relates to a removable pressure-sensitive adhesive device, comprising at least one traction member secured to a strip of highly cohesive and elastic adhesive mass, the adhesive power of which is reduced by stretching in the plane of the joint, characterized in this that the traction member is a non-adhesive strip situated in the extension of the adhesive strip and partially embedded in an area of one end of said adhesive strip.
• An advantage of the present invention resides in the fact that the traction member being distinct from the adhesive strip while being intimately linked to the latter, the entire adhesive surface of said strip can be used while leaving the traction member accessible when the object to be fixed is separated from the support.
• the traction member which is preferably a thin film can have lengths suited to the objects to be fixed and thus reduce the adhesive strip according to the applications, so as to reduce the price of the device. fixation.
• the fixing device consists of a stack of adhesive strips with the interposition of peelable protectors and each provided with a grip and traction tab.
• FIG. 1 is a perspective view of a fixing device according to a first embodiment
• FIG. 2 is a schematic elevation view of a second embodiment of the fixing device according to the invention.
• FIG. 3 is a schematic representation of an object fixed on a support using the device shown in FIGS. 1 or 2,
• FIG. 4 is a schematic representation of a stack of fastening devices according to the invention.
• the device consists of: a) a film of highly cohesive adhesive mass which has the property of greatly reducing its adhesive power when a traction is applied parallel to the plane of the joint or plane of attachment to a support, b) a film of non-adhesive material, very slightly extensible, intimately linked to the film of adhesive mass, and which serves as a gripping means for cause the stretching necessary for detachment of said adhesive mass film, c) means for suppressing the adhesive power of the parts of each of the faces of the adhesive mass film opposite the part constituting the internal connection between the non-adhesive film and the film of adhesive mass, d) possibly removable protectors to temporarily cover the faces of the adhesive film.
• the adhesive device according to the invention (FIG. 1) comprises a strip 1 of strongly stretchable adhesive mass and at least one gripping and traction tab 2, cohesive, non-adhesive and very slightly stretchy.
• the gripping tab 2 is inserted, in part, into the thickness of the strip 1 and at one end of the latter, over an area 2 ′ of predetermined dimensions so that a very strong connection is obtained between the strip 1 and the tongue 2, which makes it possible to exert, if necessary, strong pulls on the tongue 2 without fear of either a tearing or a separation between the band 1 and the tongue 2.
• FIG. 2 represents, in profile, a preferred embodiment of the invention, as obtained in practical form.
• the adhesive mass strip 1 is intimately linked to the tongue 2 which is constituted by a film 2 by means of a part 2 ′ of the film 2 which is included in the mass 1.
• the parts 7 and 8 of the two faces 9 and 10 of the adhesive mass strip 1 which are opposite the part 2 ′ of the film 2 are made non-adhesive by means of another film, a coating or a non-varnish adhesive 3 and 3 '.
• the faces 9, 10 of the adhesive mass strip 1 are each coated with a temporary protector 4 and 4 'which the user removes at the time of use.
• the adhesive device according to the invention finds its application in the assembly of objects between them or on a support and makes it possible to obtain a fixing which is both solid and removable. During the fixing, it is necessary to leave a part of the strip 2 accessible in order to be able to pull it and thus cause the detachment of the adhesive part when it is desired to separate the assembly. By choosing a film 2 made of transparent material, the part which must necessarily remain accessible is practically invisible.
• FIG. 3 represents an example of use in which an object 5 has been fixed to a wall 6 by means of the strip 1, the film 2 remaining accessible while the entire strip of adhesive material is behind the object.
• an adhesive mass sensitive to pressure with high cohesion is used.
• the strip of adhesive mass suitable for this embodiment must indeed have characteristics such that the breaking force is substantially greater than the release force.
• pressure-sensitive adhesive masses of the extrudable hot-melt type are preferred, formulated using synthetic elastomers of the triblock type and tackifying resins.
• the synthetic elastomers it is preferable to choose elastomers of the Styrene-Isoprene-Styrene type which provide good elasticity and good cohesion.
• the tackifying resins rosin resins or hydrogenated aliphatic or aromatic resins are preferred. These constituents are, in the usual way, formulated with other possible constituents such as plasticizers, antioxidants, agents protecting from ultraviolet radiation, fillers, dyes, odorous agents, bitterness agents ...
• the strip adhesive mass is obtained by hot extrusion, with a thickness of between 0.5 and 3 mm.
• the pull tab or film 2 consists of a strip of resistant material, very little stretch and of small thickness.
• a polyester film is used which has advantageous characteristics for carrying out the invention: excellent mechanical strength, non-extensible, good adhesion with the adhesive mass, transparency.
• the thickness of such a film is approximately 6 to 50 ⁇ m, preferably 12 to 25 ⁇ m.
• other components such as a fine fabric or a film of synthetic material reinforced with the aid of a non-extensible weft.
• a film of the MELINEX type sold by ICI is used.
• the pull tab must be intimately linked to the adhesive mass, this connection being essential for the proper functioning of the device.
• this connection is created by complexing two films of adhesive mass on a part of the film serving as a tongue or by integrating into the adhesive mass, at the time of extrusion, a part of the tongue, and thus obtaining a bond such as shown in Figure 1.
• the length of the part 2 ′ is approximately 3 to 10 mm, preferably 4 to 5 mm.
• the bonding zone non-adherent on the two faces of the adhesive mass, as represented by the marks 3 and 3 ′ on the Figure 2.
• These areas can be made non-adherent by any known means such as for example by depositing a thin film of synthetic material, a paper, an acrylic varnish, a layer of silicone or a pulverulent material such as talc.
• a removable protective film 4, 4 ′ of a known type, such as a paper, a polyester film, is placed on each of the faces 9, 10.
• a polyethylene film all of these protectors being treated to be made non-stick on at least one side.
• a silicone polyester film is used on one side, 23 ⁇ m thick, sold by the company SILICONATURE, under the reference RP0023M81A. If a presentation of these adhesive devices is desired in the form of a battery 11, each element 1a, 1b, 1c is separated by a protector 12, the two faces of which are treated to be made non-stick differently. Each element or adhesive device can thus be removed from the stack, leaving the protector on the next element of the stack, as shown in FIG. 4.
• the devices are presented in the form of square or rectangular pellets, the dimensions of which may be different depending on the intended use.
• the device may have a width of approximately 20 to 30 mm, an adhesive length of approximately 20 to 50 mm and a pull tab of length 30 to 50 mm. .
• the adhesive mass is prepared from 37.86 parts of SIS triblock elastomer (sold under the brand VECTOR 421 ID by the company EXXON), 9.46 parts of plasticizer based on paraffin oil (marketed under the reference CATENEX N956 by the company SHELL), 47.6 parts of rosin resin (marketed under the reference DERTOLINE SP2 by the company DRT), 1.52 parts of antioxidants, 0.51 parts of anti-UV agent, 2.27 parts of titanium oxide, 1.01 part of a bitterness agent and 0.05 part of colorant .
• the mixture is kneaded hot at a temperature of about 160 to 180 ° C and extruded by means of a flat nozzle so as to obtain two ribbons of 0.5 mm thick and 30 mm wide.
• the two ribbons are then joined together by trapping on one side a width of 5 mm of a polyester film with a thickness of 23 ⁇ m and a total width of 30 mm.
• a continuous ribbon is obtained, the section of which is shown in FIG. 1.
• a strip of a polyester film 6 ⁇ m thick is then deposited on the edge of each of the faces of the complex, on the bonding zone. mass-film.
• the width of the film deposited is 6 mm and protrudes slightly (about 1 mm) above the polyester film.
• a protective layer of silicone polyester film is placed on each face of the mass on the face opposite the adhesive mass.
• a strip is obtained at this stage, the cross section of which is shown in FIG. 2. This strip is then cut to obtain the devices according to the invention, the width of which is approximately 20 mm and the thickness is approximately 1 mm.
• such an adhesive element can fix an object of approximately 1 kg on a vertical wall, the surfaces of the object and of the wall having to be flat and made of a non-stick material.
• This example is described to illustrate the invention: it is possible to modify, for example, the formulation of the adhesive mass, the nature of the film, the tongue, the nature of the anti-adhesives and protectors without departing from the scope of the invention.
• the dimensions of the devices can also be modified to adapt to different needs, provided, however, that a sufficient thickness of the strip of adhesive mass is maintained so that the breaking strength of said strip remains substantially greater than the force necessary for detachment on any type of support.
• Removable self-adhesive devices as described above find their application in the field of DIY, housework or industry, whenever it is necessary to obtain a temporary fixing of an object on a support and it is desired not to leave traces or perforations.
• an object such as for example a paper dispenser
• one or more devices according to the invention are glued to the object, after having removed one of the protectors 4, taking care to position the tabs of traction so that they remain accessible after fixing, then place the assembly on the wall, after removing the second protector 4 '.
• the object is then fixed without the adhesive part being visible and only the pull tab made of transparent material remains visible.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Adhesive Tapes (AREA)
• Adhesives Or Adhesive Processes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9494149

Family Applications (1)

Country Status (6)

Cited By (30)

Families Citing this family (2)

Citations (3)

• 1996
  • 1996-07-17 FR FR9608953A patent/FR2751338B1/fr not_active Expired - Lifetime
• 1997
  • 1997-07-09 PT PT97932869T patent/PT912645E/pt unknown
  • 1997-07-09 EP EP97932869A patent/EP0912645B1/de not_active Expired - Lifetime
  • 1997-07-09 DE DE69700962T patent/DE69700962T2/de not_active Expired - Fee Related
  • 1997-07-09 WO PCT/FR1997/001246 patent/WO1998003601A1/fr active IP Right Grant
  • 1997-07-09 ES ES97932869T patent/ES2142689T3/es not_active Expired - Lifetime

Patent Citations (3)

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